I just read Are You The Real You, which is a comment or abstract to or on the book Stop Being Reasonable by Eleanor Gordon-Smith.
This article is a great psychological view on the essence of identity. And as the central person in this article Alex, changes his whole identity, I think: what part of Alex decided to do this, like the hermit crab inside his shell? So what is the kernel inside Alex’ personality that decided that? Is that the real Alex?